Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6744964cd2a932c…

MALICIOUS

PDF

78.7 KB Created: 2021-04-02 05:56:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7c75e525aa6321b14d7e2b06017f1e6 SHA-1: da28b83d58eafd28eccca34347b725eda40e3f5d SHA-256: d6744964cd2a932c8b204d1dd7c04936c2eda8077a9d11d5f6ba01b7b0137a16
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, with a high concentration on disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to malicious sites, likely as a first stage for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://botokaw.ru/strik?utm_term=printing+art+lesson+plan
    • http://lnstagramcopyrighthelps.com/120903958307d5az.pdf
    • https://cdn-cms.f-static.net/uploads/4416304/normal_604033cba979f.pdf
    • https://cdn-cms.f-static.net/uploads/4495694/normal_601d7a2762f00.pdf
    • http://feyakast.online/ziviritiy5ja8.pdf
    • http://souve.me/spice_and_wolf_light_novel_englishj0tmb.pdf
    • http://kupuzuzopojesu.22web.org/zafowekoxa.pdf
    • http://formulamoney.top/kant_transcendental_aesthetic_sparknotesuq11r.pdf
    • http://changepass.online/shakespeare_retold_julius_caesar_summary_in_teluguzxtcj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kajufikuxididon.rf.gd/rafagona.pdf
    • http://volajigatume.epizy.com/what_setting_should_i_run_my_pellet_stove_on.pdf
    • http://nerakovunimi.epizy.com/95335762760.pdf
    • http://xewuvafamimeze.rf.gd/foboxa.pdf
    • https://9c50f6df-e9c1-453e-a208-eff1cefe231f.filesusr.com/ugd/44b3dc_6ca0893f079d43739e241945b88b910f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/bf38eb57-c972-49dc-b7ab-ae28e2434d23/35157832582.pdf
    • https://8458b573-1d6d-478c-912c-b10a972f31df.filesusr.com/ugd/150112_169bccb8c02d4392a31479ccfc17dfc4.pdf?index=true
    • https://dc688580-c0ec-4ade-910b-7abffd870ab4.filesusr.com/ugd/096b61_aa0c80953251422583d1ad0633886492.pdf?index=true
    • https://uploads.strikinglycdn.com/files/cb180f8b-0ca0-4370-a37c-08a6409a848a/insinkerator_instant_hot_water_dispenser_repair.pdf
    • http://tufuripisaren.epizy.com/99745850.pdf
    • https://c0b8f06b-4e98-4d3d-89ef-2f08caba629a.filesusr.com/ugd/0c8cc8_12e113235e4943b08c020f01533281ee.pdf?index=true
    • http://luvibiw.epizy.com/wibujoloboru.pdf
    • https://ad9e3d1f-bb22-46ca-892e-b6aa3325a756.filesusr.com/ugd/837d34_8c03670eb039404782c2e8ed2e998e61.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f49f.bin
0b0f3bdfc3c959b92a1bf1c3576cdeaf333e7e542398b8a178798abeebadd994		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF49F 4988 bytes
font_01_sfnt_off000105a7.bin
325a4d36fa8a0b030bc68b712328a5fd2c273e2aa3e99fca2c7d0b5ddf9d98dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105A7 11572 bytes

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